Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
121 巻, 1409 号
(January)
選択された号の論文の27件中1~27を表示しています
Feature: Ceramics Processing through Energy Consumption Reduction (Green Processing): Review
  • Mamoru YOSHIMOTO, Ryosuke YAMAUCHI, Daishi SHIOJIRI, Geng TAN, Satoru ...
    2013 年 121 巻 1409 号 p. 1-9
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    Epitaxial growth of oxide films at lower temperatures is favored to obtain sharp interfaces and flat surfaces which are of advantage to construct high-quality electronic devices, and also is expected to result in novel development of unequilibrium structure and new electronic functionalization. Pulsed laser deposition (PLD) technique using laser ablation of a solid target is known to reduce the temperature drastically for epitaxial growth because of the highly energetic film precursors ablated from the target. In this article we briefly review the main achievements of our research group on room-temperature (RT, 20°C) synthesis of epitaxial oxide thin films by way of laser MBE process, i.e. PLD in ultrahigh vacuum. RT-epitaxial film growth by laser MBE and its electronic application were presented for some functional oxide thin films such as ZnO, Sn-doped In2O3 (ITO), sapphire (α-Al2O3), (Li,Ni)O, or (Mg,Ni)O, and also magnetic functionalization via selective post-depositional reduction of complex oxide films was demonstrated.
Feature: Ceramics Processing through Energy Consumption Reduction (Green Processing): Papers
  • Hidetoshi MIYAZAKI, Shin-ichi KIKITSU, Hisao SUZUKI, Nobuyasu ADACHI, ...
    2013 年 121 巻 1409 号 p. 10-12
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    SmNiO3 (SNO) films were fabricated on quartz substrates by a spin coating method using Sm–Ni based aqueous solution. SNO film annealed at 700°C showed low crystallinity, while film annealed at 800°C showed high crystallinity. The transmittance of these films did not vary above or below the transition temperature of SNO. SNO films were also fabricated on an SNO seeding layer, with crystalline SNO film obtained at an annealing temperature of 700°C. The transmittance of the resulting film changed above and below the transition temperature of SNO.
  • Tadahiko NISHIMORI, Yusuke AKIYAMA, Takashi NAOHARA, Tsunehiro MAEHARA ...
    2013 年 121 巻 1409 号 p. 13-16
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    A superparamagnetic magnetic Y3Fe5O12 ferrite of 20.5 nm in particle size was prepared by bead milling using 0.05 mmφ beads for 10 h. The heat generation ability in an AC magnetic field (370 kHz, 1.77 kA·m−1) was 0.34 W·g−1 for the bead-milled sample and was improved by calcination at low temperature. The main reason for this heat generation property of the milled samples was ascribed to a Néel relaxation of the superparamagnetic material. The maximum ability of 0.46 W·g−1 in an AC magnetic field (370 kHz, 1.77 kA·m−1) was obtained for the sample (36.8 nm in particle size) calcined at 700°C. The heat generation ability was decreased with particle growth when the calcination temperature was higher than 700°C. For the sample calcined at 600°C, the heat generation ability (W·g−1) was proportional to the square of the magnetic field (H/kA·m−1). In the case of the calcination at 700°C, the heat generation ability (W·g−1) depended on the cube of the magnetic field. The heat generation mechanism would change from superparamagnetic to ferrimagnetic due to the pariticle growth at 700°C.
  • Hidetoshi MIYAZAKI, Masato MIYOSHI, Hisao SUZUKI, Toshitaka OTA
    2013 年 121 巻 1409 号 p. 17-20
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    Composite films with an array of needle like TiO2 particles in urethane resin matrix were fabricated by applying AC bias. The resulting composite films showed angular dependence of transmittance in the visible-NIR wavelength range. The angular dependence of transmittance of the film increased with the increase in the aspect ratio of the TiO2 particles. The composite films using needle like TiO2 particles with an aspect ratio of 19 indicated that the transmittance changed by 25.4% between 0 and 60° at a wavelength of 500 nm.
  • Hiromichi AONO, Tomoya KAN, Yoshiteru ITAGAKI, Ken-ichi YAMAGUCHI, Shu ...
    2013 年 121 巻 1409 号 p. 21-25
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    A heteronuclear (NH4)2Sr[FeII(CN)6] complex having a tetragonal phase was synthesized from Sr(NO3)2 and (NH4)4[FeII(CN)6]·nH2O. A single phase of the heteronuclear (NH4)2XLa1−XSrX[Fe(CN)6]·nH2O complex was synthesized by the coprecipitation for two heteronuclear hexacyano complexes of La[FeIII(CN)6]·5H2O and (NH4)2Sr[FeII(CN)6]. In this chemical method, the X value (Sr content) for the complex was lower than that of the starting material. This (NH4)2XLa1−XSrX[Fe(CN)6]·nH2O complex was also obtained by a mechanochemical reaction using a planetary ball-mill for two complexes (Total 0.01 mol = ca. 4 g) of (1 − X)La[FeIII(CN)6]·5H2O and X(NH4)2Sr[FeII(CN)6] with a small amount (5 ml) of methanol. The hydration number calculated from the elemental analysis agreed with the estimated values when a hexagonal single (NH4)0.8La0.6Sr0.4[Fe(CN)6]·4.2H2O phase formed for X = 0.4. This reaction for X = 0.4 was also possible for the dry process without methanol. In the case of X > 0.4, the peaks of the SrFe- complex were observed in the XRD pattern. The perovskite phase was directly formed by the thermal decomposition at a low temperature for the milled X = 0.4 complex.
  • Takanori NUNOME, Hiroshi IRIE, Naonori SAKAMOTO, Osamu SAKURAI, Kazuo ...
    2013 年 121 巻 1409 号 p. 26-30
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    In the equilibrium state, although ZnFe2O4 is paramagnetic, it is known that its magnetic property can be modified under nonequilibrium perturbations such as rapid cooling. Ultrasonic spray pyrolysis is a kinetic process involving rapid cooling. In this work, ferrimagnetic ZnFe2O4 particles were synthesized successfully. Furthermore, by changing the carrier gas, p-type and n-type ZnFe2O4 particles were synthesized. The p-type ZnFe2O4 showed low photocatalytic activity, but n-type ZnFe2O4 showed considerably strong activity against UV light. Recently, synthesis of magnetically separable photocatalyst has been developed with hybrid or composite of ferrite and TiO2. The fact that our ZnFe2O4 particles show both ferrimagnetic and photocatalytic properties indicates that this material will present new vistas as a magnetically separable photocatalyst.
  • Takahiro TAKEI, Maho NAKAMURA, Akira MIURA, Nobuhiro KUMADA, Kiyohiko ...
    2013 年 121 巻 1409 号 p. 31-35
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    One of the calcium aluminate, 12CaO·7Al2O3, was synthesized from calcium sulfite hemihydrate waste which was produced as a by-product of calcium polysulfide. The calcium sulfite waste was at first pre-treated by sodium salts, Na2CO3 and Na2C2O4. Then, the waste was converted to the CaCO3 and CaC2O4, respectively. From these pre-treated sample, 12CaO·7Al2O3 phase was formed at 850°C for the converted CaCO3 from Na2CO3 and at 650°C for the converted CaC2O4 from Na2C2O4. These crystallization temperatures are much lower than from reagent CaCO3 and CaC2O4 at 1250 and 850°C, respectively. The reason of such reduction of crystallized temperature may result from impurity Fe2O3 including in the by-product. Actually, addition of Fe2O3 into the reagent CaCO3 posed decrease of crystallization temperature of 12CaO·7Al2O3 from 1250 to 1050°C.
  • Yiwen ZHANG, Hanae KIJIMA, Nobukiyo KOBAYASHI, Shigehiro OHNUMA, Hiros ...
    2013 年 121 巻 1409 号 p. 36-39
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    The interest in the soft magnetic nano-composite films has grown to realize down-sized microelectronic devices at GHz frequency. In this study, the good soft magnetic Co–TiN nano-composite films were successfully prepared at room temperature (RT) by a sputtering method. XPS results prove that the Co in the films is pure metallic state. The nano-composite films show good frequency response of permeability, which resonance frequency is as high as 1.3 GHz. The films have high magnetic loss absorption (Ploss/Pin) around 1.5 GHz range, which have a high potential for noise suppressors in high frequency devices.
  • Masaki KAKIAGE, Naoki TAHARA, Rie WATANABE, Ikuo YANASE, Hidehiko KOBA ...
    2013 年 121 巻 1409 号 p. 40-44
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    The dispersion state of boron oxide (B2O3) and carbon components in a precursor prepared from a condensed boric acid (H3BO3)-polyol product by thermal decomposition in air was found to be closely related to the formation of boron carbide (B4C) powder at a low synthesis temperature. The microstructure in the precursor was fabricated by controlling the composition of a condensed H3BO3-poly(vinyl alcohol) (PVA) product. The size of B2O3 particles dispersed in the carbon matrix of the microstructure decreased with increasing PVA content of the condensed product. Crystalline B4C powder with a little free carbon was synthesized from a precursor with a more finely and homogeneously dispersed structure consisting of B2O3 particles and the carbon matrix by heat treatment at 1200°C for 5 h in an Ar flow. Furthermore, the formation and subsequent grain growth of B4C particles were promoted even at a low synthesis temperature.
  • Daiki SUZUKI, Naonori SAKAMOTO, Kazuo SHINOZAKI, Hisao SUZUKI, Naoki W ...
    2013 年 121 巻 1409 号 p. 45-48
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    Epitaxial barium hexaferrite [BaFe12O19 (BaM)] thin films were grown on YSZ-buffered Si(001) substrates using a PLD apparatus in which an electromagnet had been installed (dynamic aurora PLD). We examined the effects of applying a magnetic field (up to 2 kG) on the crystal structure and magnetic properties during deposition. The application of the magnetic field during deposition had little effect on the orientation, residual strain, and Curie temperature of BaM thin films. However, the crystallinity and saturation magnetization of the films were lowered. Possible reasons for the lowering of saturation magnetization are discussed.
  • Yoshikazu KAMESHIMA, Koji KAGEYAMA, Yuuki MIZUNUMA, Takayuki KOMATSU, ...
    2013 年 121 巻 1409 号 p. 49-53
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    Zirconia-cluster/saponite composites were prepared and evaluated as solid acid catalysts. The saponite layer was destructed in the composite through the dissolution of Al ion. The amount of zirconia-cluster in the composites was positively correlated with the Al amount, suggesting that zirconia-cluster inhibits the Al dissolution. Both the amounts of Brønsted and Lewis acids were increased by combining zirconia-cluster to saponite. Results show that Lewis acid on the saponite surface plays an important role on the entire catalytic activity on isomerization of 1-butene. The zirconia-cluster/saponite catalysts provided higher activity with a longer lifetime on this reaction than a commercial montmorillonite-based catalyst.
  • Naoto KITAHARA, Hiroaki KAGEYAMA, Tomoya KAWASAKI, Kazutomo ABE, Hiden ...
    2013 年 121 巻 1409 号 p. 54-61
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    NiCuZn ferrite–(Ba0.7Sr0.3)TiO3 (BST) composite ceramics with the BST content of up to 50 vol % were fabricated by sintering compacted powder mixtures at 900°C. The granulation of the BST powder and addition of a Bi2O3-based oxide additive effectively assisted the densification of the composite samples. The samples thus fabricated showed required εr values whereas their μr values were considerably reduced, especially for those with lower BST contents. From the detailed examinations on the effect of the Bi2O3-based oxide additives and on the process modification to improve the reduced μr values, the addition of a Bi2O3–ZnO additive with the eutectic composition of as low as 1 wt % was enough to produce a densified 10 vol % BST composite sample with a highest μr value. It was also found that the incorporation of ferrite granules calcined at 600°C caused further improvement of μr. Thus, a densified 10BST composite sample with μr = 125 was fabricated by low-temperature sintering at 900°C.
  • Naofumi UEKAWA, Tatsuya FUJINO, Takashi KOJIMA, Kazuyuki KAKEGAWA
    2013 年 121 巻 1409 号 p. 62-67
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    ZnO nanoparticles and their stable sols were prepared by heating an ethylene glycol solution of Zn(NO3)2·6H2O (0.1 mol/L, 50 mL) with 2 mL of NH3 aq at 328 K for 24 h. The obtained sol contained ZnO nanoparticles with average diameter of around 20 nm. The particle size decreased with increased the concentration of NH3. Furthermore, the ZnO nanoparticles dispersed in the sols showed a green photoluminescence peak around 550 nm. The heating procedure of the ethylene glycol solution at 328 K yielded stable sols of ZnO nanoparticles with photoluminescence characteristics. In order to control the photoluminescence characteristics of the ZnO nanoparticles, the ethylene glycol solution which contained zinc nitrate hydrate, glucose, and 1 mol/L of NH3 aq was heated at 328 K for 24 h. The obtained ZnO nanoparticles dispersed in the sols showed a blue photoluminescence peak at around 420 nm. The glucose reacted with Zn2+ ions as a reduction agent. Accordingly, the simple one-pot synthesis process using the heating of the ethylene glycol solution containing zinc nitrate hydrate, NH3, and glucose achieved control of photoluminescence spectra and enabled the stable dispersion of ZnO nanoparticles.
  • Tokio MIMURA, Tomohiro UMEDA, Yoshiro MUSHA, Kiyoshi ITATANI
    2013 年 121 巻 1409 号 p. 68-73
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    A novel hemostatic agent was prepared using phosphoryl oligosaccharides of calcium (POs-Ca), hydroxyapatite [Ca10(PO4)6(OH)2; HAp] obtained by the hydrolysis of POs-Ca (i.e., sugar-containing HAp (s-HAp), Ca/P ratio = 1.56, 60.3 mass% calcium-deficient HAp and 39.5 mass% organic materials) and thermoplastic resin (random copolymer of ethylene oxide and propylene oxide; EPO). The gel formed by mixing the EPO with water (EPO/water mass ratio: 0.20) was flash frozen at −80°C and then freeze-dried at −50°C for 15 h. The freeze-dried material was blended with POs-Ca or s-HAp. The hemostat, whose consistency had been adjusted to that of commercial hemostat by adding water, possessed the stanching times: 6.0 h (s-HAp/EPO hemostat; s-HAp/EPO = 0.20) > 5.75 h (POs-Ca/EPO hemostat; POs-Ca/EPO = 0.20) > 4.75 h (EPO hemostat). The test for the implantation of these composite hemostats into the Japanese white rabbits indicated that the bone regeneration of s-HAp/EPO composite hemostat was excellent, compared to the case of POs-Ca/EPO composite hemostat. The loading of gentamicin, a typical antibiotic agent, to the s-HAp/EPO composite hemostat showed the steady state releasing in the phosphate buffered saline.
  • Nobuhiro KUMADA, Akira MIURA, Takahiro TAKEI, Indri Badria ADILINA, Sy ...
    2013 年 121 巻 1409 号 p. 74-79
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    Alkaline earth metal titanates ATiO3 (A: Mg, Ca, Sr, Ba) were prepared from two types of layered potassium titanates [K2Ti2O5 and K0.6Ti1.85O4 (hereafter, Lss)] by using alkaline earth metal molten salts [ACl2 + A(NO3)2 (1:1)]. For A = Ca a single phase of perovskite-type compound was prepared at 600°C by using both starting compounds and the reaction temperature was lower than in 400°C that of the solid state reaction with TiO2 (anatase) and CaCO3. A single phase of perovskite-type SrTiO3 was obtained at 600 and 700°C for K2Ti2O5 and Lss, respectively and these temperatures were much lower than that (1200°C) of the solid state reaction with TiO2 (anatase) and SrCO3. In the case of perovskite-type BaTiO3 a single phase of perovskite-type compound was prepared at 700°C by using both starting compounds and also this temperature was much lower than that (above 1300°C) of the solid state reaction with TiO2 (anatase) and BaCO3. Although neither K2Ti2O5 nor Lss could produce a single phase of ilmenite-type MgTiO3, it was prepared by the solid state reaction with TiO2 (anatase) and magnesium basic carbonate at 900°C. A single phase of ilmenite-type CdTiO3 was prepared from K2Ti2O5 by using cadmium molten salts [CdCl2 + Cd(NO3)2 (1:1)] at 500°C. By taking account of the fact that ilmenite-type CdTiO3 transforms to perovskite-type structure, this preparative method using layered potassium titanates with molten salts preferred to crystallize perovskite-type titanates at lower temperature rather than ilmenite-type ones.
  • Tomoya OHNO, Tomoyuki SUGIURA, Shinji WATANABE, Hisao SUZUKI, Takeshi ...
    2013 年 121 巻 1409 号 p. 80-83
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    Barium titanate (BTO) hollow particles were prepared using two-step chemical solution deposition with a template particle. Polystyrene (PSt) was selected as the template particle, and N-(hydroxymethyl)acrylamide (HMAm) was polymerized as a comonomer to generate the hydrophilic group on the PSt template particle surface. The BTO monophase was attained at [Ba]/[TiO2] = 1.0 using 350°C pre-annealed TiO2 precursor hollow particles. The obtained BTO particle was a hollow structure with shell thickness of approximately 45 nm. The surface area of the obtained BTO hollow particle was 12 m2/g, which was approximately twice as large as that of alkoxide-derived BTO particles created with the same annealing temperature.
  • Syuhei YAMAGUCHI, Naoya KIMOTO, Hirotoshi SASAGAWA, Keiko TAKIGUCHI, T ...
    2013 年 121 巻 1409 号 p. 84-88
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    Two kinds of heterometal coordination polymer precursors, {Sm[M(ox)3]·nH2O}x (M = Fe and Co), were prepared by the reaction of K3[M(ox)3]·3H2O with Sm(NO3)3·nH2O in methanol solvent. These compounds were found to have oxalato-bridged network structure. On the other hand, the desired heterometal coordination polymer precursors could not be obtained by the present preparation method using water solvent. The thermal decomposition behaviors of these d-f heterometal coordination polymer precursors were investigated under air atmosphere. The perovskite-type oxides, SmMO3 (M = Fe and Co), were found to form in the temperature range of >600°C. The specific surface area of SmFeO3 powder increased with decreasing calcination temperature of Fe-containing heterometal coordination polymer precursor.
Feature: Ceramics Processing through Energy Consumption Reduction (Green Processing): Technical reports
  • Paulina WIECINSKA, Yoshio SAKKA, Tohru S. SUZUKI, Tetsuo UCHIKOSHI, Ta ...
    2013 年 121 巻 1409 号 p. 89-94
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    Textured ceramic materials arouse recently great interest due to the effective improvement of their physical and mechanical properties compared to those not crystalline oriented. Feeble magnetic ceramics, such as alumina can be textured under high magnetic field of 12T during shaping process. The connection between shaping by gelcasting method and crystalline orientation of α-alumina in high magnetic field is reported in this paper. Gelcasting allows obtaining high-quality complex-shaped elements with small quantities of organic binders. A new environmentally friendly compound on the basis of glucose (3-O-acryloyl-D-glucose) was synthesized and applied as a monomer in gelcasting process. The ceramic slurries of solid loading 30–50 vol % have been exposed to high magnetic field at the time of consolidation through an in situ polymerization of used monomer. The degree of crystalline orientation of sintered at 1600°C bodies was evaluated by X-ray diffraction (XRD).
  • Susumu NAKAYAMA, Ryushiro TOKUNAGA, Masaki SHIOMI, Takahiro NAKA
    2013 年 121 巻 1409 号 p. 95-99
    発行日: 2013/01/01
    公開日: 2013/01/01
    ジャーナル フリー
    The perovskite oxide, LaFeO3, was synthesized by different preparation methods, i.e., the calcination of co-precipitated precursors [La(Ag)–Fe–CO3 and La–Fe–CO3] and a mixture of La2O3 and Fe2O3 (La–Fe–O). By using the solution of Ag, the formation temperature (600°C) of the LaFeO3 single phase obtained by the calcining of La(Ag)–Fe–CO3 was about 500°C lower than that of La–Fe–CO3. The formation temperature of the LaFeO3 single phase of La–Fe–O was 1100°C as well as that of La–Fe–CO3. Their carbon oxidations were investigated by DSC (differential scanning calorimetry) measurements. The DSC exothermic peak of La0.9Ag0.1FeOα obtained by the calcining of La(Ag)–Fe–CO3 at 700°C occurred at 409°C and showed a higher carbon oxidation activity when compared to LaFeO3 (477 and 562°C) obtained by the calcining of La–Fe–CO3 and La–Fe–O at 1100°C. The carbon oxidation activation energies observed for the non-catalyzed and catalyzed reactions (mixture of La0.9Ag0.1FeOα) were 160 and 130 kJ·mol−1, respectively.
Feature: Ceramics Processing through Energy Consumption Reduction (Green Processing): Notes
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